how can i transmit analog video signal?

for some application i need to transmit an analog video signal without cables, maybe through sound? or light/laser?
is there some way that i can do it?
i saw this instructable doing a similar thing:
is the circuit capable of doing it with analog video signals?

also, i know that when i transmit it in its analog form, losses will be significant. is it possible to transmit it in digital form and convert it back to analog? how?